1. Department of Urology, Kidney and Urology Center, Pelvic Floor Disorders Center, The Seventh Affiliated Hospital, Sun Yat-sen University, Shenzhen 518107, China
2. Scientific Research Center, the Seventh Affiliated Hospital, Sun Yat-sen University, Shenzhen, Guangdong 518107, China
3. Department of Ultrasound, The Seventh Affiliated Hospital, Sun Yat-sen University, Shenzhen 518107, China
4. Department of Urology, The Sun Yat-sen Memorial Hospital, Sun Yat-sen University, Guangzhou 510120, China